I have a Tekmagic 2060, and also a Blizzard 2060, and I must say I profer the Blizzard. When I first got my Tekmagic I had trouble finding an A2000 motherboard revision it would work with. Also, the Temagic Scsi controller isn't NSD compliant, so it only boots from filesystems in the Rom, so no booting from SFS or PFS partitions as far as I'm aware. I think the Blizzard scsi is a bit faster too.
The Tekmagic is a great card if you've got the right revision motherboard though :-) I have my boot partition using FFS with Directory cache, and all others are SFS, works fine.
Robert